Make a camera loader duf that doesn't wipe out existing cameras?

Camera preset scripts, as created by DS, all seem to replace all existing cameras in the scene. I want to make a camera preset that will add itself to the scene, instead. Is that possible? I don't see anything in the DUF file that seems to trigger the elimination of the other cameras. I suppose I could try faking it by changing the type to "prop" instead, but before I mess around with that, is there a supported way of doing this?

I don't know why the page numbering in this thread is so weird, but my last thread about render scripts does the same thing. I guess I'm just special.

In any case, yes, I know how to use ctrl-click, I'm just trying to find a way to set up a script that the user won't have to do this with, as many new users don't know about it. And I think ditching all the cameras in a scene when loading a new camera is a bit weird, to be honest. I can sort of understand this with light sets, but cameras don't interfere with one another. Set the loaded camera as the active camera, sure, but sometimes there are good reasons to have more than one camera in a scene, especially if some of them have special effects.

Camera Presets was a thing I had never thought about before, and I just tried saving with a Face cam and a few others as a Preset. It works really well saving multiple cameras, and if you use the same ones over and over, a Camera Preset is a great idea.